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PR28523, ld.bfd created undefined symbols on ppc64

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This patch removes any fake (linker created) function descriptor
symbol if its code entry symbol isn't dynamic, to ensure bogus dynamic
symbols are not created.  The change to func_desc_adjust requires that
it be run only once, which means ppc64_elf_tls_setup can't call it for
just a few selected symbols.

	PR 28523
	* elf64-ppc.c (func_desc_adjust): If a function entry sym is
	not dynamic and has no plt entry, hide any associated fake
	function descriptor symbol.
	(ppc64_elf_edit): Move func_desc_adjust iteration over syms to..
	(ppc64_elf_tls_setup): ..here.
This commit is contained in:
Alan Modra
2021-11-02 19:01:06 +10:30
parent b480ee76e4
commit a442059f66
1 changed files with 14 additions and 16 deletions
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28
bfd/elf64-ppc.c
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@ -6281,7 +6281,8 @@ tls_get_addr_epilogue (bfd *obfd, bfd_byte *p, struct ppc_link_hash_table *htab)
/* Called via elf_link_hash_traverse to transfer dynamic linking
information on function code symbol entries to their corresponding
function descriptor symbol entries. */
function descriptor symbol entries. Must not be called twice for
any given code symbol. */
static bool
func_desc_adjust (struct elf_link_hash_entry *h, void *inf)
@ -6339,8 +6340,12 @@ func_desc_adjust (struct elf_link_hash_entry *h, void *inf)
if (ent->plt.refcount > 0)
break;
if (ent == NULL)
{
if (fdh != NULL && fdh->fake)
_bfd_elf_link_hash_hide_symbol (info, &fdh->elf, true);
return true;
}
}
/* Create a descriptor as undefined if necessary. */
if (fdh == NULL
@ -6464,12 +6469,6 @@ ppc64_elf_edit (bfd *obfd ATTRIBUTE_UNUSED, struct bfd_link_info *info)
= (htab->elf.hgot->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;
}
if (htab->need_func_desc_adj)
{
elf_link_hash_traverse (&htab->elf, func_desc_adjust, info);
htab->need_func_desc_adj = 0;
}
return true;
}
@ -7783,6 +7782,13 @@ ppc64_elf_tls_setup (struct bfd_link_info *info)
if (htab == NULL)
return false;
/* Move dynamic linking info to the function descriptor sym. */
if (htab->need_func_desc_adj)
{
elf_link_hash_traverse (&htab->elf, func_desc_adjust, info);
htab->need_func_desc_adj = 0;
}
if (abiversion (info->output_bfd) == 1)
htab->opd_abi = 1;
@ -7830,10 +7836,6 @@ ppc64_elf_tls_setup (struct bfd_link_info *info)
tga = elf_link_hash_lookup (&htab->elf, ".__tls_get_addr",
false, false, true);
htab->tls_get_addr = ppc_elf_hash_entry (tga);
/* Move dynamic linking info to the function descriptor sym. */
if (tga != NULL)
func_desc_adjust (tga, info);
tga_fd = elf_link_hash_lookup (&htab->elf, "__tls_get_addr",
false, false, true);
htab->tls_get_addr_fd = ppc_elf_hash_entry (tga_fd);
@ -7841,8 +7843,6 @@ ppc64_elf_tls_setup (struct bfd_link_info *info)
desc = elf_link_hash_lookup (&htab->elf, ".__tls_get_addr_desc",
false, false, true);
htab->tga_desc = ppc_elf_hash_entry (desc);
if (desc != NULL)
func_desc_adjust (desc, info);
desc_fd = elf_link_hash_lookup (&htab->elf, "__tls_get_addr_desc",
false, false, true);
htab->tga_desc_fd = ppc_elf_hash_entry (desc_fd);
@ -7853,8 +7853,6 @@ ppc64_elf_tls_setup (struct bfd_link_info *info)
opt = elf_link_hash_lookup (&htab->elf, ".__tls_get_addr_opt",
false, false, true);
if (opt != NULL)
func_desc_adjust (opt, info);
opt_fd = elf_link_hash_lookup (&htab->elf, "__tls_get_addr_opt",
false, false, true);
if (opt_fd != NULL